Add axisFormat to @nivo/bullet

[alternatekev]

Added axisFormat prop to Bullet & BulletItem in order to format the horizontal axis of bullet chart beyond simple numbers. This supports dates as well as any numerical formatting. Addresses #1736

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[stale]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[stale]

Closing this pull request after a prolonged period of inactivity. If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!

[therealgabryx]

Can this issue be re-opened? Facing the same problem with this chart, would be useful to be able to customize the axes (as in, for example, formatting label numbers, or not showing each increment)

[olchyk98]

bump

[therealgabryx]

maybe merge?

[angelomarcelino]

bump